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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Value of Goodwill
Goodwill consists of the following:
 
As of December 31,
 
2015
 
2014
 
(in thousands)
Balance, January 1
$
130,976

 
$
142,972

Cogent acquisition
93,116

 
—

Foreign currency translation adjustments
(15,068
)
 
(11,996
)
Balance, December 31
$
209,024

 
$
130,976